Malicious PDF — malware analysis report

Static analysis result for SHA-256 5507e849b523f464…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 09:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 108f7cb1cff189d8427d2ed5640ec5ab SHA-1: 1b91aca550a3c5d6e80b37f59c6ebe1c8f350951 SHA-256: 5507e849b523f464bd03a2b993cd93a8857c82063b89e6f38042fc9e42d0329a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads and disposable hosting. This suggests the document is designed to act as a lure, potentially redirecting users to phishing sites or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://canadanur.com/resimler/files/pasuk.pdf In PDF document text
    • https://drosamahetta.com/userfiles/file/19308043971.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/60942156987.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16110ef1825b15---29732712047.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bdf030dd0---43863291763.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/0ff7ee2df4f93945326e9137e14cce9e/14071776118.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/74122458686.pdfIn PDF document text
    • http://camelliafb.com/uploads//files/202108032312309990.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/30061026621.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/84635891901.pdfIn PDF document text
    • http://rafaelokazakov.com/file/64751867378.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/25845416730.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/eaa2bb81fc83fa53f0624cebf29e1345/tedevuxi.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/jopenikiwixijur.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/vaxajugamuximos.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/navelosop.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/51876cf4ec8803dee97c76f1895a67a1/kurazesatirafoza.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d761d2aad4595d41249d043f0eda61d0/kokafos.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/memif.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xavegukijuso.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/76619729963.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609401f8cbff6---logudexemewesejejozowev.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/voratiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+printable+topographic+map+worksheetsPDF link annotation
    • https://mediaget.com/userfiles/files/dalewanaretowofezimeza.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 16728 bytes
SHA-256: c4dbe3185dc08c3bc141facab1a7eccb9e1b509af59f79d62e601732df1ac8c3
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 11116 bytes
SHA-256: 5ab336666145546c5df32db401729d524ae7b847ac1807865c9180a4860c6fb6